Bremsstrahlung tagged photon beam in Hall B at JLab

D. I. Sober, Hall Crannell, Alberto Longhi, S. K. Matthews, J. T. O'Brien, B. L. Berman, W. J. Briscoe, Philip L. Cole, J. P. Connelly, W. R. Dodge, L. Y. Murphy, S. A. Philips, Michael Dugger, D. Lawrence, Barry Ritchie, E. S. Smith, James M. Lambert, E. Anciant, G. Audit, T. AugerC. Marchand, M. Klusman, J. Napolitano, M. A. Khandaker, C. W. Salgado, A. J. Sarty

Research output: Contribution to journalArticle

179 Citations (Scopus)

Abstract

We describe the design and commissioning of the photon tagging beamline installed in experimental Hall B at the Thomas Jefferson National Accelerator Facility (JLab). This system can tag photon energies over a range from 20% to 95% of the incident electron energy, and is capable of operation with beam energies up to 6.1 GeV. A single dipole magnet is combined with a hodoscope containing two planar arrays of plastic scintillators to detect energy-degraded electrons from a thin bremsstrahlung radiator. The first layer of 384 partially overlapping small scintillators provides photon energy resolution, while the second layer of 61 larger scintillators provides the timing resolution necessary to form a coincidence with the corresponding nuclear interaction triggered by the tagged photon. The definitions of overlap channels in the first counter plane and of geometric correlation between the two planes are determined using digitized time information from the individual counters. Auxiliary beamline devices are briefly described, and performance results to date under real operating conditions are presented. The entire photon-tagging system has met or exceeded its design goals.

Original languageEnglish (US)
Pages (from-to)263-284
Number of pages22
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume440
Issue number2
DOIs
StatePublished - Feb 1 2000

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photon beams
bremsstrahlung
Photons
Phosphors
scintillation counters
photons
marking
counters
electron energy
hodoscopes
nuclear interactions
Electrons
Radiators
radiators
Particle accelerators
Magnets
energy
accelerators
magnets
plastics

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics

Cite this

Bremsstrahlung tagged photon beam in Hall B at JLab. / Sober, D. I.; Crannell, Hall; Longhi, Alberto; Matthews, S. K.; O'Brien, J. T.; Berman, B. L.; Briscoe, W. J.; Cole, Philip L.; Connelly, J. P.; Dodge, W. R.; Murphy, L. Y.; Philips, S. A.; Dugger, Michael; Lawrence, D.; Ritchie, Barry; Smith, E. S.; Lambert, James M.; Anciant, E.; Audit, G.; Auger, T.; Marchand, C.; Klusman, M.; Napolitano, J.; Khandaker, M. A.; Salgado, C. W.; Sarty, A. J.

In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 440, No. 2, 01.02.2000, p. 263-284.

Research output: Contribution to journalArticle

Sober, DI, Crannell, H, Longhi, A, Matthews, SK, O'Brien, JT, Berman, BL, Briscoe, WJ, Cole, PL, Connelly, JP, Dodge, WR, Murphy, LY, Philips, SA, Dugger, M, Lawrence, D, Ritchie, B, Smith, ES, Lambert, JM, Anciant, E, Audit, G, Auger, T, Marchand, C, Klusman, M, Napolitano, J, Khandaker, MA, Salgado, CW & Sarty, AJ 2000, 'Bremsstrahlung tagged photon beam in Hall B at JLab', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 440, no. 2, pp. 263-284. https://doi.org/10.1016/S0168-9002(99)00784-6
Sober, D. I. ; Crannell, Hall ; Longhi, Alberto ; Matthews, S. K. ; O'Brien, J. T. ; Berman, B. L. ; Briscoe, W. J. ; Cole, Philip L. ; Connelly, J. P. ; Dodge, W. R. ; Murphy, L. Y. ; Philips, S. A. ; Dugger, Michael ; Lawrence, D. ; Ritchie, Barry ; Smith, E. S. ; Lambert, James M. ; Anciant, E. ; Audit, G. ; Auger, T. ; Marchand, C. ; Klusman, M. ; Napolitano, J. ; Khandaker, M. A. ; Salgado, C. W. ; Sarty, A. J. / Bremsstrahlung tagged photon beam in Hall B at JLab. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2000 ; Vol. 440, No. 2. pp. 263-284.
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AU - Longhi, Alberto

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AU - O'Brien, J. T.

AU - Berman, B. L.

AU - Briscoe, W. J.

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AU - Lambert, James M.

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AU - Audit, G.

AU - Auger, T.

AU - Marchand, C.

AU - Klusman, M.

AU - Napolitano, J.

AU - Khandaker, M. A.

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